Datasheet schematics? - Electronic Circuits Projects Diagrams Free

Ventura · 6th January 2008, 02:38 AM

I've seen it mentioned that sample schematics are available with semiconductor datasheets, but, looking (online) at different manufacturer's datasheets for the LM741 amplifier IC, I could not find anything except the schematic of the IC's own internal circuitry.
Clearly I'm missing something....?

Thank you

felis · 6th January 2008, 02:58 AM

What kind of circuit do you have in mind?

kchriste · 6th January 2008, 03:01 AM

Basically, general purpose OpAmp circuits will work with the 741:
http://ecow.engr.wisc.edu/cgi-bin/ge.../opampckts.pdf
A page more specific about older OpAmps like the 741:
http://www.uoguelph.ca/~antoon/gadgets/741/741.html

speakerguy79 · 6th January 2008, 03:13 AM

Google "AN-31"

Papabravo · 6th January 2008, 04:02 AM

I suggest you forget about that one; National's last time buy date was more than 3 1/2 years ago. Try the TL081 from Texas Instruments.
http://focus.ti.com/lit/ds/symlink/tl081b.pdf

Ventura · 6th January 2008, 06:58 PM

It's become necessary for me to deal with (document) an intermittent but long-term harassment problem outside my home, and I need a basic preamp for a microphone that will be placed in my carport, maybe 20'--30' from a security DVR with a simple RCA phono jack input. I do have a decent quality(if slightly large-for-the-purpose) dynamic mic that sends an "unbalanced" signal down a 9' cord. Member "chemelec" recommended I use an electret condenser mic and power it from the preamp board.
I'm not sure what to do. I just wanted to see if I could find a simple preamp design that might work in this application.

Thanks for all replies.

ericgibbs · 6th January 2008, 07:43 PM

hi,
You could consider buying a simple kit.

http://www.amazing1.com/simplex.htm

Look at the mike preamp SIM1024 $9.50

Ventura · 7th January 2008, 04:07 AM

Hi, Eric,
Thank you. I ended up doing just that. I'm torn between the desire to build a fine quality preamp and the need to simply get this security system up and running wiki wiki. I had been considering another small preamp kit, price-reduced to about $8, but was annoyed that their shipping/handling more than doubled the price. They're in Utah, not that far away from me. I'd rather spend that money on better components and build it myself.
The Smart-Kit you mentioned is being sent to me from the opposite end of the U.S. for just $3 shipping. That's certainly fair.

Thanks, again.
Bye

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6th January 2008, 02:38 AM	(permalink)
Ventura	Datasheet schematics? I've seen it mentioned that sample schematics are available with semiconductor datasheets, but, looking (online) at different manufacturer's datasheets for the LM741 amplifier IC, I could not find anything except the schematic of the IC's own internal circuitry. Clearly I'm missing something....? Thank you

6th January 2008, 02:58 AM	(permalink)
felis	What kind of circuit do you have in mind?

6th January 2008, 03:01 AM	(permalink)
kchriste	Basically, general purpose OpAmp circuits will work with the 741: http://ecow.engr.wisc.edu/cgi-bin/ge.../opampckts.pdf A page more specific about older OpAmps like the 741: http://www.uoguelph.ca/~antoon/gadgets/741/741.html __________________ --- The days of the digital watch are numbered. ---

6th January 2008, 03:13 AM	(permalink)
speakerguy79	Google "AN-31"

6th January 2008, 04:02 AM	(permalink)
Papabravo	I suggest you forget about that one; National's last time buy date was more than 3 1/2 years ago. Try the TL081 from Texas Instruments. http://focus.ti.com/lit/ds/symlink/tl081b.pdf __________________ We never have time to do it right; but we always have time to do it over.

6th January 2008, 06:58 PM	(permalink)
Ventura	It's become necessary for me to deal with (document) an intermittent but long-term harassment problem outside my home, and I need a basic preamp for a microphone that will be placed in my carport, maybe 20'--30' from a security DVR with a simple RCA phono jack input. I do have a decent quality(if slightly large-for-the-purpose) dynamic mic that sends an "unbalanced" signal down a 9' cord. Member "chemelec" recommended I use an electret condenser mic and power it from the preamp board. I'm not sure what to do. I just wanted to see if I could find a simple preamp design that might work in this application. Thanks for all replies.

6th January 2008, 07:43 PM	(permalink)
ericgibbs	hi, You could consider buying a simple kit. http://www.amazing1.com/simplex.htm Look at the mike preamp SIM1024 $9.50 __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/

7th January 2008, 04:07 AM	(permalink)
Ventura	Hi, Eric, Thank you. I ended up doing just that. I'm torn between the desire to build a fine quality preamp and the need to simply get this security system up and running wiki wiki. I had been considering another small preamp kit, price-reduced to about $8, but was annoyed that their shipping/handling more than doubled the price. They're in Utah, not that far away from me. I'd rather spend that money on better components and build it myself. The Smart-Kit you mentioned is being sent to me from the opposite end of the U.S. for just $3 shipping. That's certainly fair. Thanks, again. Bye